When people want to invite their friends to their homes,what do they often say?
when引导的时间状语从句
say"Thank you"if you agree;say"Sorry"if you disagree.
if引导的条件状语从句
what people say is like an invitation but it's not a real one.
what引导的主语从句.but引导的并列句
They are not real invitations because they don't talk about the exact date or time.
because引导的原因状语从句.
They just show that the person is trying to be friendly.
that引导的宾语从句.
So next time people invite you to their homes,listen carefully.
next time引导的,省略that的定语从句.